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Method for representing component and isotope fractionation effect in natural gas adsorption and desorption process of shale

A technology of adsorption, desorption and fractionation, applied in the direction of material separation, analysis of materials, measuring devices, etc., can solve the problems of incomplete reflection of shale gas desorption process, limited, gas loss, etc.

Inactive Publication Date: 2016-06-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] It can be seen that the current research on the competitive adsorption of shale gas is still very limited, and all of them are carried out under the condition of low temperature and pressure.
In addition, the samples used in tank desorption experiments and vacuum ball milling desorption experiments will lose a lot of gas during the drilling and sampling process, and the experimental results cannot fully reflect the desorption process of shale gas

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  • Method for representing component and isotope fractionation effect in natural gas adsorption and desorption process of shale

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[0056] In order to make the purpose, research method and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] The technical method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0058] In this study, the shale of the lower Shahejie Formation in Well He 172, Jiyang Depression, Bohai Bay Basin, China was selected, with a depth of 3336.79m and organic matter type II 1 type. The original total organic carbon content of the sample was 2.98%, and the pyrolysis parameters were as follows: S 1 =2.15mg / g, S 2 =16.74mg / g, Tmax=443°C; the total organic carbon content after extraction is 2.75%, and the pyrolysis parameters are as follows: S 1 =0.14mg / g, S...

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Abstract

The invention relates to a method for representing the component and isotope fractionation effect in the natural gas adsorption and desorption process of shale and belongs to the technical field of instruments used for analyzing materials by aid of measuring physical properties of the materials. The problem that in the prior art, due to the fact that a large amount of gas is lost in the drilling and sampling process, the experiment result cannot completely reflect the desorption process of shale gas is solved. According to the method, a competitive adsorption experiment is carried out in the shale gas adsorption and desorption process under high temperature and high pressure conditions, qualitative analysis is conducted on component fractionation in the process, qualitative analysis is conducted on isotope fractionation, and meanwhile a Langmuir model and an adsorption model are adopted for conducting numerical simulation on the adsorption quantity and the isotope value. Thus, elaborate description of the competitive adsorption effect in the shale gas adsorption and desorption process is realized, and it is beneficial for guiding gas-driven exploitation of the shale gas. The method can be widely applied to mathematical simulation research, gas-driven exploitation of the shale gas and other occasions.

Description

technical field [0001] The invention relates to a method for characterizing components and isotope fractionation in the process of shale adsorption and desorption of natural gas, and belongs to the technical field of instruments for analyzing materials by means of measuring their physical properties. Background technique [0002] Adsorption phase is one of the important phases of shale gas occurrence, which is of great significance to the exploration and development of shale gas. Previous studies on shale gas in the adsorption phase mainly focused on the factors affecting the adsorption capacity of shale gas and corresponding quantitative simulations. There were few studies on the component and isotope fractionation caused by competitive adsorption in the shale adsorption and desorption process. The difference in the adsorption performance of various components of natural gas determines that some gases have strong (weak) adsorption capacity, are easily (difficult) to be adso...

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Application Information

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IPC IPC(8): G01N30/00
CPCG01N30/00
Inventor 李吉君黄开展马妍卢双舫薛海涛张亚念阴建新
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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